https://community.hpe.com/t5/operating-system-vmware/vm-server-sudden-spike-in-memory-used-during-load-test/m-p/4579371#M619 Hello, <BR /><BR />I just started load testing apps hosted on VMware for a few months now. Currently, we are load testing an tomcat app on a VM Redhat linux server. I've ran several 24 hour load tests and at the last hour of the load test, the used memory on the server (-/+buffers/cache) spikes for about 10 to 15 minutes, then it returns back to normal. I do see performance degradation during this spike. <BR />Now, I setup monitors to caputure every process memory usage during the 24 hour load test and nothing shows up eating or consuming free memory. The tomcat java process is not growing, so it does not seem that the app is causing this issue. at this point, i'm thinking that there might be something wrong with the VM server itself. don't know what to think about this now... by the way, I load tested tomcat apps in VMs before and never saw this spikes in memory used. <BR /><BR />has anyone experience this issue before? <BR />is there an issue/bug with the VMWare software? Fri, 05 Feb 2010 22:55:27 GMT martinezH 2010-02-05T22:55:27Z https://community.hpe.com/t5/operating-system-vmware/vm-server-sudden-spike-in-memory-used-during-load-test/m-p/4579371#M619 Hello, <BR /><BR />I just started load testing apps hosted on VMware for a few months now. Currently, we are load testing an tomcat app on a VM Redhat linux server. I've ran several 24 hour load tests and at the last hour of the load test, the used memory on the server (-/+buffers/cache) spikes for about 10 to 15 minutes, then it returns back to normal. I do see performance degradation during this spike. <BR />Now, I setup monitors to caputure every process memory usage during the 24 hour load test and nothing shows up eating or consuming free memory. The tomcat java process is not growing, so it does not seem that the app is causing this issue. at this point, i'm thinking that there might be something wrong with the VM server itself. don't know what to think about this now... by the way, I load tested tomcat apps in VMs before and never saw this spikes in memory used. <BR /><BR />has anyone experience this issue before? <BR />is there an issue/bug with the VMWare software? Fri, 05 Feb 2010 22:55:27 GMT https://community.hpe.com/t5/operating-system-vmware/vm-server-sudden-spike-in-memory-used-during-load-test/m-p/4579371#M619 martinezH 2010-02-05T22:55:27Z https://community.hpe.com/t5/operating-system-vmware/vm-server-sudden-spike-in-memory-used-during-load-test/m-p/4579372#M620 What version of vcenter and ESX are you using? I have experience similar problems in older versions. Mon, 08 Feb 2010 20:54:33 GMT https://community.hpe.com/t5/operating-system-vmware/vm-server-sudden-spike-in-memory-used-during-load-test/m-p/4579372#M620 Gordon Sjodin 2010-02-08T20:54:33Z